package com.baosu.reggie.controller.user;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baosu.reggie.common.BaseContext;
import com.baosu.reggie.common.R;
import com.baosu.reggie.entity.ShoppingCart;
import com.baosu.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

/**
 * 购物车
 */
@Slf4j
@RestController
@RequestMapping("/shoppingCart")
public class ShoppingCartController {

    @Autowired
    private ShoppingCartService shoppingCartService;

    /**
     * 添加购物车
     * @param shoppingCart
     * @return
     */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车数据:{}",shoppingCart);

        //设置用户id，指定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

        //根据用户id和 (菜品id/套餐id)锁定唯一记录
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
            //1、查询条件一：用户id
        queryWrapper.eq(ShoppingCart::getUserId,currentId);
            //2、查询条件二：菜品id或者套餐id
        Long dishId = shoppingCart.getDishId();
        if(dishId != null){
            //添加到购物车的是菜品 dishId
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else{
            //添加到购物车的是套餐 setmealId
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }
            //select * from shopping_cart where user_id = ? and dish_id/setmeal_id = ?
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);


        //查询当前菜品或者套餐是否在购物车中
        if(cartServiceOne != null){
            //如果已经存在，就在原来数量基础上加 1
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number + 1);
            shoppingCartService.updateById(cartServiceOne);
        }else{
            //如果不存在，则添加到购物车，数量默认就是 1
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }
        return R.success(cartServiceOne);
    }

    /**
     * 购物车 -1
     * @param shoppingCart
     * @return
     */
    @PostMapping("/sub")
    public R<ShoppingCart> sub(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车数据:{}",shoppingCart);

        //设置用户id，指定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

        //根据用户id和 (菜品id/套餐id)锁定唯一记录
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        //1、查询条件一：用户id
        queryWrapper.eq(ShoppingCart::getUserId,currentId);
        //2、查询条件二：菜品id或者套餐id
        Long dishId = shoppingCart.getDishId();
        if(dishId != null){
            //添加到购物车的是菜品 dishId
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else{
            //添加到购物车的是套餐 setmealId
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }
        //select * from shopping_cart where user_id = ? and dish_id/setmeal_id = ?
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

        //查询当前菜品或者套餐是否在购物车中
        if(cartServiceOne != null){
            Integer num = cartServiceOne.getNumber();
            //如果菜品数量小于5，就清空购物车
            if(num < 1){
                shoppingCartService.deleteById();
                return null;
            }
            //如果已经存在，就在原来数量基础上加 -1
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number - 1);
            shoppingCartService.updateById(cartServiceOne);
        }
        return R.success(cartServiceOne);
    }

    /**
     * 查看购物车
     * @return
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list(){
        log.info("查看购物车");

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        queryWrapper.orderByAsc(ShoppingCart::getCreateTime);

        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);
        return R.success(list);
    }

    /**
     * 清空购物车
     * @return
     */
    @DeleteMapping("/clean")
    public R<String> clean(){
        log.info("清空购物车");

        shoppingCartService.deleteById();
        return R.success("清空购物车成功");
    }

 
 }